RunyaoChen opened a new pull request, #39711:
URL: https://github.com/apache/spark/pull/39711
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### What changes were proposed in this pull request?
This PR improves error messages for `ARRAY` / `MAP` / `STRUCT` types without
element type specification. A new error class `INCOMPLETE_TYPE_DEFINITION` with
subclasses (`ARRAY`, `MAP`, and `STRUCT`) is introduced.
**Details**
In the case where we do `CAST AS` or `CREATE` a complex type without
specifying its element type,
e.g.
```
CREATE TABLE t (col ARRAY)
```
`[UNSUPPORTED_DATATYPE] Unsupported data type "ARRAY"` error would be
thrown, while we do support the `ARRAY` type and just require it to be typed.
This PR proposes a better error message like
```
The definition of `ARRAY` type is incomplete. You must provide an element
type. For example: `ARRAY\<INT\>`.
```
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### Why are the changes needed?
The previous error message for incomplete complex types is confusing. A
`UNSUPPORTED_DATATYPE` error would be thrown, while we do support complex
types. We just require complex types to have their element types specified. We
need a clear error message with an example in this case.
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### Does this PR introduce _any_ user-facing change?
Yes, this PR changes the error message which is user-facing.
Error message before this PR:
```
spark-sql> SELECT CAST(array(1, 2, 3) AS ARRAY);
[UNSUPPORTED_DATATYPE] Unsupported data type "ARRAY"(line 1, pos 30)
```
Error message after this PR:
```
[INCOMPLETE_TYPE_DEFINITION.ARRAY] Incomplete complex type: The definition
of `ARRAY` type is incomplete. You must provide an element type. For example:
`ARRAY\<INT\>`.
```
Similarly for MAP and STRUCT types.
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### How was this patch tested?
Added unit tests covering CAST and CREATE with ARRAY / STRUCT / MAP types
and their nested combinations.
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